| 释义 |
WordReference Random House Unabridged Dictionary of American English © 2024py•re•thrum (pī rē′thrəm, -reth′rəm),USA pronunciation n. - Plant Biologyany of several chrysanthemums, as Chrysanthemum coccineum, having finely divided leaves and showy red, pink, lilac, or white flowers, cultivated as an ornamental.
- Plant Biologyany of several chrysanthemums, as C. cinerariifolium, or C. coccineum, cultivated as a source of insecticides.
- Drugs[Pharm.]the dried flower heads of these plants, used chiefly as an insecticide and sometimes in medicine for certain skin disorders.
- Greek pýrethron, akin to pyretós fever; compare pellitory
- Latin: pellitory
- 1555–65
Collins Concise English Dictionary © HarperCollins Publishers:: pyrethrum /paɪˈriːθrəm/ n - any of several cultivated Eurasian chrysanthemums, such as Chrysanthemum coccineum and C. roseum, with white, pink, red, or purple flowers
- any insecticide prepared from the dried flowers of any of these plants, esp C. roseum
Etymology: 16th Century: via Latin from Greek purethron feverfew, probably from puretos fever; see pyretic |